The term smart grid describes a special type of electricity grid that can be operated particularly efficiently thanks to the communicative networking of many electricity generators and consumers. Comprehensive load management can be carried out in a smart grid, as consumption and generation can be better regulated. Smart grids are an important prerequisite for the increased integration of electricity generators powered by renewable energies. Specifically, for example, electricity consumers (e.g. washing machines) can be automatically switched on when there is a high feed-in (e.g. due to strong sunshine in photovoltaic systems) in the grid